Condensed Consolidated Statements of Shareholders' Deficit (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2019	$ 1,123	$ 746,112	$ (819,294)	$ (72,059)
Issuances of nonvested stock	23	(23)
Compensation recognized under stock compensation plans		34		34
Net loss			(1,314)	(1,314)
Balance at Mar. 31, 2020	1,146	746,123	(820,608)	(73,339)
Balance at Dec. 31, 2020	1,146	746,227	(828,463)	(81,090)
Issuances of nonvested stock	20	(20)
Compensation recognized under stock compensation plans		35		35
Net loss			(1,380)	(1,380)
Balance at Mar. 31, 2021	$ 1,166	$ 746,242	$ (829,843)	$ (82,435)